Note : Automatic reminders uses native WordPress cron. If the traffic on your site isn’t sufficient to trigger crons quite often, you should trigger crons by another way to be sure your crons are triggered :
– add : define('DISABLE_WP_CRON', true); into your wp-config.php
– setup a cron on your server (or with a cron tool) on this command : wget http://www.myserver.com/wp-cron.php?doing_wp_cron

version 1.1.1 :
- Adding a hook during reminder sending process
- Prefix the post_meta with an _

version 1.1 :
- Add an order note when sending the reminder
- Display de date of the sent reminder in the tooltip

version 1.0.1 :
- Remove a deprecated function

version 1.0 :
- New email “Payment reminder”. To configure : WooCommerce > Settings > Emails
- New action button in orders panel to send the email
- New “email resend action” in the order detail to send the email
- Compatible with Wordpress 3.8.1 and WooCommerce 2.0 or 2.1